Intercom sub-station



FIG. 1 is a perspective view of the intercom sub-station showing our new design;

FIG. 2 is a left side elevational view of the intercom sub-station shown in FIG. 1;

FIG. 3 is a top plan view of the intercom sub-station of FIG. 1;

FIG. 4 is a front elevational view of the intercom sub-station of FIG. 1;

FIG. 5 is a right side elevational view of the intercom sub-station of FIG. 1;

FIG. 6 is a rear elevational view of the intercom sub-station of FIG. 1; and,

FIG. 7 is a bottom plan view of the intercom sub-station of FIG. 1. 

The ornamental design for an intercom sub-station, as shown and described. 